Headquartered in Córdoba, Argentina, Claro was launched in Argentina, Paraguay and Uruguay on March 25, 2008 in a rebranding of CTI Móvil. As of 31 March 2007[update] the former served more than 12,795 million subscribers on CDMA/1XRTT and GSM/GPRS/EDGE wireless.[citation needed]

CTI Móvil purchased Hutchison Telecommunications Paraguay (which operated as "Port Hable") in July 2005 to begin serving customers in that country. As of 2006, Claro competed with international operators such as Tigo (Millicom), Personal (Telecom Argentina-Telecom Italia) and VOX (formerly KDDI. VOX was acquired in 2011 by the state landline company, COPACO). In these countries, the company used slogans such as "Es simple. Es Claro." ("It's simple. It's clear") and "Claro es Internet móvil de alta velocidad." ("Claro is high-speed mobile Internet.")

While Claro has developed a large market share in Colombia, data for prepaid customers indicates that Claro has lost market share to competing providers Tigo and Movistar; this may be due to Claro's position as the most-expensive per-minute provider in the country's prepaid market.[citation needed] Tigo and Movistar offer prepaid customers flat-rate per-minute plans for calls placed to all mobile service providers and landlines within Colombia (229 and 199 pesos per minute, respectively). The cheapest per-minute rate for Claro prepaid customers is 249 pesos per minute, a rate valid for only nine "preferred Claro numbers". Per-minute rates increase for calls to Claro numbers not on a customer's "preferred" list and all calls to other cellphone providers or landline numbers.

After the opening of telecommunications in Costa Rica when the monopoly of the ICE Group was dissolved, the government opened a tender for telecommunications companies wishing to enter Costa Rica. Superintendencia de Telecomunicaciones (SUTEL) of Costa Rica secured a license, and the company began offering lines on November 5, 2011 to users who had registered on their website or through social networks. Service began on November 11.

Claro Chile was originally known as Chilesat PCS, which later renamed to Smartcom PCS. Claro was launched in Chile on August 6, 2006, after its acquisition of Smartcom PCS. Slogans such as "Yo soy Claro, y me gusta." ("I am Claro, and I like it.") have appeared in advertisements.

In the mobile operator segment, Claro is third in market share behind Movistar and Entel.

Claro was launched in the Dominican Republic on January 31, 2007 after its acquisition of Verizon Dominicana on April 3, 2006. Its Dominican Republic slogans have included "Claro que tienes más" ("Of Course you have more") and "La Red donde todo es posible" ("The network where everything is possible").

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In Ecuador, America Movil was present with Conecel (commercially known as Porta) until February 2011. The name "Porta" was switched to "Claro" as part of America Movil's business strategy. It is the country's leading operator, with nearly nine million subscribers.

Claro was introduced in El Salvador, Honduras and Nicaragua in September 2006 as a rebranding of the former PCS Digital, Alo, Personal and Enitel. Slogans such as "Cubrimos tus Momentos, Cubrimos tus Lugares, Cubrimos tu Nación, Cubrimos tu Diversión, Cubrimos El Salvador. Siempre estás cubierto con Claro." ("We cover your moments, we cover your places, we cover your nation, we cover your entertainment, we cover El Salvador. You are always covered with Claro.") and "Hablamos de todo... Hablamos Claro." ("We talk about everything... We talk 'Clear' ['Claro'].") have been used in El Salvador. In Honduras, "Hablamos de todo... Hablamos Claro." ("We talk about everything... We talk 'Clear' ['Claro'].") and "Claro que tienes más." ("Of course you have more.") are two slogans that have been used. "Claro. La vida en tus manos." ("Of course (claro). Life is in your hands.") and "Claro que si." ("Yes, of course") have been used in Nicaragua.

On November 16, 1996, the Guatemalan Congress passed the "Ley General de Telecomunicaciones"; The General Telecommunications Law that stipulated the privatization of Guatel, the former, state-owned, telecommunications company. It was purchased by LUCA S.A. and Ricardo Bueso became Telgua's first President and CEO until 2000. In 2000, it joined America Movil and some time after it renamed the brands ALO and PCS Digital to Claro on Guatemala.

Claro was introduced in Guatemala on September 7, 2006 as a rebranding of Telgua-owned PCS Digital and Alo de PCS. As of March 31, 2007 Claro in Guatemala had more than 5.2 million subscribers, with CDMA/1XRTT, GSM/GPRS/EDGE and UMTS/HSDPA (some cities with HSPA) wireless technology.

Claro was introduced in Jamaica as a replacement for the MiPhone company. Oceanic Digital Jamaica Limited (ODJ) was a wholly owned subsidiary of América Móvil, providing service under the Claro name. The company built a GSM/UMTS/HSDPA network with the CDMA network, and plans included fixed wireless and broadband service on the CDMA network (competing with Digicel and LIME).[2] The Jamaican company was acquired by Digicel in late 2011, and the network was closed (with permission from the outgoing Jamaica Labour Party government) in March 2012.[3]

Claro was introduced in Puerto Rico on May 18, 2007-May 18, 2014 as a replacement for Verizon Wireless. It is the wireless arm of Puerto Rico Telephone, which offers landline telephone and data services on the island. One problem with the transition has been the non-portability telephones to the United States (to which many Puerto Ricans travel), resulting in a preference for AT&T.

In 2012 Claro Americas was a partner in the (RED) Campaign with Adidas, American Express, Converse, China UnionPay, Legea and Servientrega. The campaign's mission is to prevent the transmission of the HIV virus from mother to child by 2015, with a slogan "Fighting For An AIDS Free Generation".[4]